Thread problems on pfaff 1245

[Burkhardt]

7 hours ago, shoepatcher said:

The length of stitch should NOT effect the tension.  If the needle hole is too small, that will affect the stitch tension because knot will get hung up on the bottom of the piece you are sewing.

glenn

How could it not? The longer distance between each stitch will affect the top bottom pull because of the distance. A long stitch will be looser than a short one or are we not talking about the same thing? I'm looking at it as you do a long stitch on a curved seam and flip it inside out it's going to look loose where the shorter stitch will be tighter because of the distance.

[shoepatcher]

Never in my 45 plus years of sewing have I had the length of the stitch affect the tension.  Sorry.

glenn

[Cwagz396]

Were you ever able to figure out the cause/solution of the tension issues? After taking it to the shop? Having the exact issue with my new-to-me PFAFF 1245 right now. It was running amazing and then I thread jammed it, threw the safety clutch (didn’t even know what it was at the time), retimed it according to the adjustment manual to best of my knowledge and the bobbin thread is looking exactly like yours. I tried tightening the top thread tension to see if that was the issue and it didn’t work. Tried loosening bobbin tension, nope. Ugh.